NylokHD® / TuflokHD®

Prevailing Torque Locking Element

NylokHD® / TuflokHD® is a high performance self-locking nylon retention element permanently bonded onto the threads of a nut via a special application technique. NylokHD® / TuflokHD® will provide greater re-usability and reduced torque scatter. When the patch is engaged, it creates a wedging action between the nut and mating part, compressing the nylon and promoting tight metal-to-metal contact opposite the patch. This metal-to-metal contact provides a positive resistance to vibration and loosening. Since nylon has great memory characteristics, this locking element is reusable. NylokHD® / TuflokHD® can be applied to nuts of any style or plating. A wide range of nut sizes can be processed.


  • Ideal for aerospace and commercial vehicle industry where weight is critical
  • Exceptional vibration resistance
  • Highly reusable
  • Torque values can be customized to meet your requirements
  • Resistant to most lubricants, fuels, hydraulic fluids and commercial solvents

Technical Data

  • Color — blue / orange (special colors available upon request)
  • Dry Wedge — immediate locking (no cure time)
  • Standard Temperature Range — -56 C (-70 F) to 121 C (250 F)
  • NytempHD  High Temperature Range — -56 C (-70 F) to 232 C (450 F)
  • Shelf-Life indefinite


download file icon NylokHD® Patch Product sheet